public IListenerRegistration AddSnapshotListener(QuerySnapshotHandler listener)
{
var registration = _collectionReference.AddSnapshotListener(new EventHandlerListener <QuerySnapshot>((value, error) =>
{
listener?.Invoke(value == null ? null : new QuerySnapshotWrapper(value),
error == null ? null : ExceptionMapper.Map(error));
}));
return(new ListenerRegistrationWrapper(registration));
}
public IListenerRegistration AddSnapshotListener(QuerySnapshotHandler listener)
{
var registration = _collectionReference.AddSnapshotListener((snapshot, error) =>
{
listener?.Invoke(snapshot == null ? null : new QuerySnapshotWrapper(snapshot),
error == null ? null : ExceptionMapper.Map(error));
});
return(new ListenerRegistrationWrapper(registration));
}
public IDisposable AddSnapshotListener <T>(Action <IQuerySnapshot <T> > onChanged, Action <Exception> onError = null, bool includeMetaDataChanges = false)
{
var registration = _wrapped
.AddSnapshotListener(includeMetaDataChanges ? MetadataChanges.Include : MetadataChanges.Exclude, new EventListener(
x => onChanged(new QuerySnapshotWrapper <T>(x.JavaCast <QuerySnapshot>())),
e => onError?.Invoke(new FirebaseException(e.LocalizedMessage))));
return(new DisposableWithAction(registration.Remove));
}
public IDisposable AddSnapshotListener <T>(Action <IQuerySnapshot <T> > onChanged, Action <Exception> onError = null, bool includeMetaDataChanges = false)
{
var registration = _wrapped.AddSnapshotListener(includeMetaDataChanges, (snapshot, error) => {
if (error == null)
{
onChanged(new QuerySnapshotWrapper <T>(snapshot));
}
else
{
onError?.Invoke(new FirebaseException(error.LocalizedDescription));
}
});
return(new DisposableWithAction(registration.Remove));
}
public static Task <IEnumerable <T> > GetCollectionAsync <T>(this CollectionReference reference) where T : class
{
var tcs = new TaskCompletionSource <IEnumerable <T> >();
reference
.AddSnapshotListener((snapshot, error) =>
{
if (error != null)
{
tcs.SetException(new Exception(error.LocalizedDescription));
return;
}
var data = snapshot.Documents.Select((doc) => Cast <T>(doc)).ToList();
tcs.SetResult(data);
});
return(tcs.Task);
}
